DE685605C - Pipe catcher operated by pressurized water for earth drilling - Google Patents

Description

Actuated by high pressure water pipe scavenger for earth boring The known pipe scavengers for withdrawal of the pipe from the well consist of a; at the lower end of the rod disposed sliding body which presses when pulling up the rod sliding blocks against the pipe wall and strands will between the Ge and clamped to the pipe, so that when the rod is pulled up further, the pipe is taken along.

It has also already been proposed that the sliding blocks by pressurized water to press against the pipe wall in such a way that when pulling up the rod .the jaws rest firmly on the pipe under the action of the pressurized water and, if the tube opposes insurmountable resistance to the tensile force, the jaws through the pressurized water can be released from the pipe wall again.

In this known pipe catcher, however, the linkage and the pipe catcher are available when pulling the linkage not only under the mechanical pulling effect, but also under the tensile stress caused by the water pressure in the longitudinal direction of the pipe, see above that under: otherwise the same conditions with this hydraulic pipe catcher only a lower mechanical tensile force may be applied if the rupture of the Rod or pipe catcher should be prevented. Also occurs with the well-known Solution to the problem of operating the pipe catcher by pressurized water, the disadvantage that water channels must lead to both sides of a control piston, the strong one Assume walls of the cylinder in which the control piston is working, so .that the control piston can only get a limited working area, and then still in the canals, which have to be strongly curved in places, the solid components the rinsing liquid: settle and possibly even the passage of water can prevent ..

According to the invention, a piston is now attached to the lower end of the rod, which piston can slide in the cylindrical interior of a sliding body. Furthermore, provision is made that the flushing water (pressurized water) outside the cylindrical ° interior, it. a: us- "occurs as long as the linkage and the sliding piece are screwed against each other, and d @ 6 - it emerges within the cylindrical space when the screw connection is loosened Rinsing water flowing into the cylindrical interior: guide the sliding piece on the stationary piston downwards, whereby the connection between the sliding body, which acts directly or indirectly on the sliding blocks, is released.

In the drawing, an embodiment of the invention is shown, namely Fig. i shows the parts clamped together before loosening the mating thread and Fig.2 the same arrangement after loosening the mating thread.

Fig.3 and q. are different cross-sections.

In the figures, a is the pipe and b is the linkage. With: the linkage b, the sliding body d is screwed through the mating thread c. Between the sliding body d and the pipe wall a are the sliding jaws e, which at their upper end with Notches f are equipped against which the collar g provided on the linkage rests, when the linkage is screwed up or pulled up. h is a sitting on the linkage b Piston that slides in the cylindrical bore i of the sliding body id. With k is : denotes the pressurized water pipe which opens at L in the borehole or in the pipe. at the position shown in Fig. i is the linkage b through the mating thread c screwed to the sliding body d, and the piston k is located in the cylindrical Drilling! of the sliding body d in its lowest position.

In the position of Fig.2, the thread c of the rod b lies above the sliding body d. At the same time, the collar g hits the notch f , and the outflow opening L : of the rod opens into the cylinder chamber. i: If pressurized water is now pumped into room i, then. this press the sliding body against the bottom of the borehole and release it from the sliding jaws e, since the sliding jaws are held in place by the collar ä and cannot follow the downward movement of the sliding piece d.

In the illustrated embodiment, t; @ t-le are conical, for Bracing serving, surfaces directly on the sliding piece d angeord - ': "et, and the The pressurized water inlet is reversed in a particularly simple manner by means of an arrangement the mouth provided in the linkage in such a position relative to the bottom of the slider d, that in one end position the bottom of the slider is below the mouth and in the other end position is above the mouth, so that the arrangement of any special valves become unnecessary.

Claims (3)

PATENT CLAIMS: i. Pressurized water operated pipe catcher for earth bores with sliding body, sliding jaws and stop, which works together with notches attached to the sliding jaws, characterized in that a piston (h) is attached to the rod (b ) and is located in a cylindrical space provided in the sliding body (d) (i) slides, and that the mouth (L) of the flushing water line (h) in the rod (b) lies outside the cylindrical space (i) : as long as rod (b) and slide (d) are screwed together , and that it lies in the cylindrical space (i) when the screw connection is loosened. 2. pipe catcher according to claim i, characterized in that the inclined surfaces bracing the sliding jaws (f) on which at the same time: the hollow cylinder (i) forming sliding body (d) are arranged. 3. Pipe catcher according to claim i and 2, characterized in that the pressurized water line (k) is extended beyond the sliding body (d) and that the mouth (L) provided in the pressurized water line in an end position of the sliding body (d) within the cylindrical interior (i) it lies; while in the other end position of the slide (d) the flushing water outlet (l) is outside the slide ( d).